package shiyan16;
import java.io.*;
import java.util.*;
public class Example10_16 {
	public static void main(String args[ ]){
		File file = new File("shangping.txt");
		Scanner sc=null;
		int count=0;
		double sum=0;
		try { 
			double score =0;
			sc = new Scanner(file);
			sc.useDelimiter("[^0123456789.]+");
			while(sc.hasNextDouble()){
				score=sc.nextDouble();
				count++;
				sum = sum + score;
				System.out.println(score);
			}
			double aver=sum/count;
			String str= String.format("%.3f",aver);
			System.out.println("平均价格:"+str);
			FileWriter fw = new FileWriter(file, true);
            fw.write("\n平均价格：" + str);
            fw.close();
		}
		catch(Exception exp){
			System.out.println(exp);
		}
	}
}
